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US20120312399A1 - Dosing pump - Google Patents

Dosing pump Download PDF

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Publication number
US20120312399A1
US20120312399A1 US13/579,677 US201113579677A US2012312399A1 US 20120312399 A1 US20120312399 A1 US 20120312399A1 US 201113579677 A US201113579677 A US 201113579677A US 2012312399 A1 US2012312399 A1 US 2012312399A1
Authority
US
United States
Prior art keywords
section
intake channel
valve
metering pump
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/579,677
Other languages
English (en)
Inventor
Sergei Gerz
Jan Knedler
Andreas Kraus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundfos Management AS
Original Assignee
Grundfos Management AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Grundfos Management AS filed Critical Grundfos Management AS
Assigned to GRUNDFOS MANAGEMENT A/S reassignment GRUNDFOS MANAGEMENT A/S ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GERZ, SERGEI, Knedler, Jan, KRAUS, ANDREAS
Publication of US20120312399A1 publication Critical patent/US20120312399A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06—Venting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump

Definitions

  • the invention relates to a metering pump with a dosing chamber, an intake channel connected with the dosing chamber, and a pressure chamber ( 20 ) connected with the dosing chamber.
  • Metering pumps are usually designed as positive-displacement pumps, and as a positive-displacement body have a piston or membrane that is moved by a drive motor.
  • the positive-displacement body displaces the volume inside the dosing chamber by a predetermined amount, so that this volume is conveyed out of the dosing chamber.
  • the dosing chamber normally has two ports, a pressure channel and an intake channel, wherein the pressure channel usually extends perpendicularly upward, and the intake channel proceeds from the dosing chamber, extending perpendicularly downward.
  • an object of the invention is to optimize a metering pump in such a way as to quickly and reliably divert from the dosing chamber gas bubbles that might be present or enter through the intake channel
  • the metering pump according to the invention has a known dosing chamber, which is connected with an intake channel, through which the medium to be conveyed, in particular the liquid to be convened, enters the dosing chamber.
  • the dosing chamber is further connected with a pressure channel, through which the medium conveyed by the metering pump exits the dosing chamber.
  • the conveying or pumping action is achieved in a conventional manner by means of a positive-displacement body, which is arranged on or in the dosing chamber.
  • the positive-displacement body can consist of a membrane or piston, for example.
  • the intake channel incorporates a means for breaking up gas bubbles, or the intake channel is designed in such a way that the gas bubbles entering it through the intake channel can be broken down into smaller gas bubbles.
  • the danger is that these large gas bubbles will adhere to the walls of the intake channel, and hence remain in the intake channel or dosing chamber.
  • the advantage to breaking the gas bubbles up into smaller gas bubbles is that it reduces the risk of adhesion to the walls of the intake channel, allowing these smaller gas bubbles to rise up through the intake channel and further through the dosing chamber into the pressure channel more quickly.
  • gas bubbles situated downstream from a valve in the intake channel in the dosing chamber rise quickly enough to reach the outlet end of the dosing chamber after 80% of the overall stroke time (period between the intake stroke and ensuing pressure stroke), i.e., the pressure channel and in particular an outlet valve lying in the pressure channel, so that they can then be expelled from the dosing chamber toward the end of the pressure stroke.
  • the means for breaking up the gas bubbles can be arranged as additional elements, for example projections, ribs or the like, in the intake channel, preferably downstream from a valve or inlet valve in the intake channel.
  • gas bubbles can be broken up or torn away by making changes to the cross section of the intake channel, thereby causing larger gas bubbles to split up into smaller gas bubbles.
  • the means for breaking up the gas bubbles in the intake channel are designed like an expanded cross section, wherein this expansion in cross section additionally preferably is sudden, i.e., taking the form of a step or shoulder.
  • the larger, i.e., expanded cross section of the intake channel in this case preferably abuts the dosing chamber.
  • the cross section of this expanded intake channel is preferably greater than the cross section of the intake channels of conventional metering pumps. This means that the cross section selected for the intake channel is intentionally larger than would be required for the normal operation of the metering pump, so as to improve the removal of gas bubbles. As a result of the cross sectional expansion, rising gas bubbles are torn away.
  • the cross section of the intake channel expand from a first, smaller cross section to a second, larger cross section, wherein the surface area of the first cross section is between 0.3 and 0.8 times the surface area of the second cross section.
  • the first narrower cross section is selected such that it essentially correspond to the cross section, in particular the smallest cross section, of an intake channel of a conventional metering pump. This means that the expanded section adjoining downstream is expanded relative to the cross sectional size of the intake channel of a known metering pump.
  • the smaller cross section is defined by the outlet of a valve, i.e., the inlet valve in the intake channel This outlet represents the narrowest point in the intake channel
  • gas bubbles first get caught in this constriction, and are then torn away at the outlet end of the constriction, i.e., at the expanded cross section, and thereby broken up into smaller gas bubbles.
  • the valve exhibit a valve body held in a cage, in particular a valve ball, and that the smaller cross section is defined by the free spaces lying between the ribs or webs of the cage and the valve body.
  • the cage or ball cage exhibits webs or ribs extending in the direction of flow, between which the valve body runs. At the downstream end, these webs or ribs project radially inward, thereby forming an axial stop there for the valve body.
  • the liquid to be conveyed flows through the free spaces between the webs and ribs.
  • the shared cross section of these free spaces defines the smaller cross section in front of the expanded cross section.
  • Three or four such ribs or webs forming the cage are preferably provided.
  • the pressure channel preferably extends in a first section, which borders the dosing chamber, upwardly at an inclination relative to the vertical, away from the dosing chamber.
  • this pressure channel i.e., outlet channel, which is situated at the vertical upper end of the dosing chamber, there are essentially no horizontally extending upper boundary surfaces in the area of the pressure channel on which gas bubbles might agglomerate.
  • the inclined progression yields upper boundary surfaces extending at an inclination relative to the vertical, along which gas bubbles rise.
  • the inclined upward progression causes the gas bubbles to continue rising upward along these surfaces, and hence automatically enter the pressure channel and rise therein. This ensures that gas bubbles in the dosing chamber that accumulate at the upper end of the dosing chamber due to buoyancy reliably enter the pressure channel, and are conveyed through the latter out of the dosing chamber as quickly as possible.
  • a second section extending in the vertical direction adjoins the first section of the pressure channel downstream.
  • gas bubbles can also rise unimpeded and cannot agglomerate in this section either. This produces a pressure channel having no horizontally running sections or walls on which gas bubbles might accumulate and adhere.
  • a valve is situated in the second section of the pressure channel
  • This valve can be a check valve, which is usually arranged at the outlet side of the dosing chamber in such metering pumps. During the intake stroke of the positive-displacement body in the dosing chamber, this valve prevents a reflux of the medium to be conveyed through the pressure channel into the dosing chamber.
  • This valve is situated in the vertical section of the pressure channel, so that there are preferably essentially no horizontal surfaces either, on which larger gas bubbles might agglomerate. In addition, this arrangement is advantageous, since such valves normally close under the force of gravity.
  • the intake channel emptying into the dosing chamber also is configured in a corresponding way, so that the intake channel in a first section bordering the dosing chamber extends downward at an inclination to the vertical, away from the dosing chamber.
  • this section of the intake channel incorporates essentially no horizontally running upper surfaces on which gas bubbles might agglomerate. Rather, the inclined progression of the gas bubbles in the intake channel allows them to rise along the inclined upper wall of the intake channel, and enter the dosing chamber. They can there continue to rise and then enter the pressure channel, as described above.
  • a second section extending in a vertical direction adjoins the first section of the intake channel upstream.
  • this section also has no horizontal surfaces on which gas bubbles might agglomerate.
  • the inclined first sections of the pressure channel and possibly the intake channel in this case also make it possible, as in the hitherto known channels, extending horizontally away from the dosing chamber, to arrange the ports and possibly the valves of the intake and pressure channels horizontally offset relative to the middle of the dosing chamber or to the side of the dosing chamber.
  • This is most often desirable for constructional reasons, in order to provide enough installation space for the ports and valves, since a positive-displacement body, such as a membrane, along with its drive, is usually arranged directly on the dosing chamber with one side, limiting the space available for incorporating ports and valves.
  • these ports and valves usually have a diameter greater than the width of the dosing chamber, in particular viewed in the stroke direction of the positive-displacement body. In this regard, it is necessary that these components extend laterally over the boundaries of the dosing chamber.
  • a valve is situated in the second section of the intake channel, i.e., in the vertically extending section of the intake channel.
  • This valve can be a check valve of the kind known for conventional metering pumps. This check valve closes during a pressure stroke, thereby preventing the medium to be conveyed from flowing back into the intake channel instead of into the pressure channel.
  • Such a valve is usually designed to close under gravitational force, making it especially favorable to be accommodated in a vertical channel section.
  • valves in the pressure channel and possibly the intake channel, it must be understood that several valves can also be arranged there in series.
  • first section of the pressure channel and/or the first section of the intake channel is inclined in a direction relative to the vertical that faces away from the positive-displacement body of the metering pump.
  • the ports for the intake and pressure channel that connect the metering pump with external line systems, and particularly the inlet and outlet valves or check valves can be laterally offset relative to the dosing chamber.
  • These components can in this case be offset toward a side facing away from the positive-displacement body and its drive, where there is sufficient space available for installing these components, in particular for the valves.
  • the pressure channel and/or intake channel is connected with the dosing chamber in the area of its outer periphery.
  • the dosing chamber preferably has a circular cross section around the horizontal axis, preferably the stroke axis of the positive-displacement body.
  • the intake channel and pressure channel in this case preferably extend away from the outer periphery of the dosing chamber at the lowest and highest point of the dosing chamber, so that no upper horizontal surfaces on which gas bubbles might accumulate form there.
  • the surfaces adjoining the inlet opening of the pressure channel are also curved, ascending to the highest point, so that gas bubbles that accumulate there can continue rising all the way up to the inlet opening of the pressure channel, where they can then continue rising in the adjoining first inclined section and the possibly adjoining second vertical section, and exit the dosing chamber.
  • the first inclined section of the pressure channel and possibly the intake channel preferably extend at an angle of between 20 and 70 degrees, more preferably at an angle of between 10 and 60 degrees, and particularly at an angle of between 10 and 60 degrees, relative to the vertical.
  • the first section of the pressure channel and/or the first section of the intake channel preferably have a diameter greater than 4 mm, more preferably greater than 5 mm, and particularly greater than 6 mm, e.g., 6.5 mm.
  • a large channel diameter of this kind ensures that larger gas bubbles can also quickly traverse the channel, and will not become lodged in the channel
  • the pressure channel has a larger diameter or cross section upstream from a valve body situated in the pressure channel than downstream from the valve body.
  • the vertical distance between the valve in the pressure channel and a valve in the intake channel i.e., the conventional check valve, is as small as possible.
  • the valves are situated as close as possible to the dosing chamber, in order to minimize the size of the channels bordering the dosing chambers and the total volume and path of the medium to be conveyed between the two valves. Reducing the distance between the valves in the pressure channel and in the intake channel shortens the rise time for gas bubbles from the valve in the intake channel to the valve in the pressure channel, thereby preferably making it possible to achieve a rise time of less than 80% of the overall stroke time of the intake and pressure stroke.
  • the vertical distance between a valve in the pressure channel and a valve in the intake channel is equal to or less than 2.5 times, and preferably equal to or less than two times, the maximum diameter of the dosing chamber transverse to the horizontal axis. This configuration yields a similarly small distance between the valves.
  • the vertical distance between a valve in the pressure channel and a valve in the intake channel is equal to or less than the outer diameter of a membrane comprising the positive-displacement body.
  • the membrane usually extends a certain distance beyond the outer diameter of the dosing chamber, since it is sealed and fixated in this area. Because the distance between the valves is equal to or less than the outer diameter of this membrane, this yields an overall very compact construction of the metering head of the metering pump, and in particular keeps the volume lying between the valves as low as possible, accompanied by the positive effects described above.
  • FIG. 1 is a sectional view of a metering pump unit according to the invention.
  • FIG. 2 is an enlarged sectional view of the pump head of the metering pump unit according to FIG. 1 .
  • the metering pump unit has a known motor housing 2 with a pump head 4 placed thereupon.
  • the motor housing 2 incorporates a drive motor 6 , which drives a connecting rod 10 , so that it moves the middle area of a membrane 12 linearly forward and backward.
  • the membrane 12 comprises the positive-displacement body on a dosing chamber 14 in the pump head 4 .
  • the dosing chamber 14 forms a defined volume, which can be decreased and increased by the motion of the membrane 12 , as a result of which the pump conveys a defined volume via the dosing chamber 14 during each stroke of the membrane 12 .
  • the pump head 4 is arranged in such a way that its upper end accommodates a pressure port 16 , and its lower end accommodates an intake port 18 .
  • the medium to be conveyed or the liquid to be conveyed is sucked via the intake port 18 .
  • the conveyed or metered liquid is released via the pressure port 18 .
  • the pressure port 16 and intake port 18 are provided to be joined with connection lines.
  • the pressure port 16 is connected with the dosing chamber 14 via a pressure channel 20 .
  • the pressure channel 20 here has a first section 22 , and a second section 24 that adjoins it downstream.
  • the first section 22 of the pressure channel 20 extends with its longitudinal axis A inclined relative to the vertical X, upward from the dosing chamber 14 .
  • This first section 22 of the pressure channel 20 here ends at the upper end of the dosing chamber 14 , which is circular in cross section relative to the horizontal axis Y.
  • the first section of the pressure channel 22 extends in a curved manner in a direction away from the dosing chamber 14 , which faces away from the positive-displacement chamber in the form of the membrane 12 or the motor housing 2 .
  • the longitudinal axis A of the first section 22 of the pressure channel 20 extends at an angle of 45 degrees relative to the vertical X and the horizontal Y.
  • another angle can be selected, preferably an angle of between 15 and 70 degrees.
  • the advantage to the inclined arrangement of the first section of the pressure channel 22 on the one hand is that the vertical second section 24 of the pressure channel 20 can be offset laterally, i.e., toward he horizontal axis Y, from the dosing chamber 14 in the direction facing away from the membrane 12 . This provides enough space to accommodate the pressure port 16 and the two valves 26 and 28 lying in the pressure channel in the pump head 4 , without having to place them in proximity to the motor housing 2 .
  • the advantage to the inclined progression of the first section 22 of the pressure channel toward to a horizontal progression lies in the fact that any existing gas bubbles in the dosing chamber 14 can rise in the inclined first section of the pressure channel 22 .
  • the remaining peripheral wall of the dosing chamber 14 is shaped in such a way that it allows gas bubbles to rise unimpeded up toward the inlet or branch of the pressure channel 20 .
  • the cross section of the first section 22 of the pressure channel 20 is provided with large enough dimensions, i.e., the cross section in this example has a diameter greater than 5 mm, allowing even larger gas bubbles to pass unobstructed.
  • the first section 22 is adjoined downstream by a vertical section 24 that accommodates the two check valves 26 , 28 , which are connected in series.
  • the perpendicular progression of the second section 24 also allows gas bubbles in the latter to rise unimpeded.
  • the valves 26 and 28 can also be closed by gravitational force.
  • the pressure channel 20 branches away from the dosing chamber 14 at its highest point.
  • the intake channel 32 empties into the dosing chamber 14 vertically opposite, i.e., at the lower end.
  • the intake channel 32 has a first section 34 adjoined downstream by a second section 36 .
  • the first section 34 of the intake channel 32 extends with its longitudinal axis B horizontally downward at an inclination to the vertical X and horizontal Y.
  • the angle of the longitudinal axis B relative to the horizontal Y and vertical X also measures 45 degrees, but a different angle could also be selected, preferably in the 15 to 70 degree range.
  • the first section 34 of the intake channel 32 does not extend horizontally, as the first section 22 of the pressure channel 20 is also not to extend horizontally according to the invention.
  • gas bubbles in the intake channel 32 can rise upward unimpeded in this section. They will glide along the upper wall of the section 34 and enter the dosing chamber 14 , where they will then rise to the first section 22 of the pressure channel 20 and be conveyed away through the latter to the pressure port 16 . Therefore, the intake channel 32 also essentially has no horizontally progressing upper boundary surfaces on which gas bubbles might agglomerate.
  • the intake port 18 with the valves 30 and 38 in the intake channel 32 can be formed in a horizontal direction, laterally offset from the dosing chamber 14 in the pump head 4 , so that these components do not collide with the membrane arrangement.
  • the valves 30 and 38 also represent two known check valves that close under gravitational force.
  • the intake channel 32 incorporates a means for breaking up gas bubbles in the entering liquid stream.
  • the means for breaking up gas bubbles is realized in the form of an expanded cross section.
  • the valve 30 is formed by a valve ball, which is held in a ball cage 31 .
  • the ball cage is comprised of ribs or webs extending parallel to the vertical X, wherein the free spaces 33 between these webs define the flow paths through the valve.
  • the free spaces 33 in the periphery of the ball and between the webs of the ball cage 31 together define a first smaller cross section, which is smaller than the cross section in the intake channel 32 adjoining downstream. In other words, the outlet end of the free spaces 33 has an expanded cross section.
  • the expanded cross section is designed in such a way that the overall cross sectional surface of the free spaces 33 preferably lies between 0.3 and 0.8 times the cross sectional surface of the intake channel 32 adjoining downstream.
  • the lateral offset of the vertical sections 24 and 36 of the pressure channel 20 or intake channel 32 makes it possible to arrange the first valve 26 on the pressure side, and the first valve 30 on the intake side, in close proximity to each other in a vertical direction X, in order to minimize the overall volume and distance between these two valves 26 and 30 , in particular the distance between these valves outside the dosing chamber 14 , i.e., essentially the length of the pressure channel 20 upstream from the valve 26 and the length of the intake channel 32 downstream from the valve 30 .
  • the distance a between the outlet side of the valve 30 and the inlet side of the valve 26 is equal to the outer diameter of the membrane 12 in the example shown.
  • Such an arrangement, in which the distance a is essentially equal to or less than the outer diameter of the membrane 12 exhibits this kind of expedient small vertical distance between the valves 62 and 30 .
  • this distance a has a magnitude equal to or less than 2.5 times, more preferably less than two times, the maximum diameter d of the dosing chamber 14 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US13/579,677 2010-02-18 2011-02-16 Dosing pump Abandoned US20120312399A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP20100001641 EP2362101B1 (de) 2010-02-18 2010-02-18 Dosierpumpe
EP10001641.9 2010-02-18
PCT/EP2011/000724 WO2011101121A1 (de) 2010-02-18 2011-02-16 Dosierpumpe

Publications (1)

Publication Number Publication Date
US20120312399A1 true US20120312399A1 (en) 2012-12-13

Family

ID=42173598

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/579,677 Abandoned US20120312399A1 (en) 2010-02-18 2011-02-16 Dosing pump

Country Status (5)

Country Link
US (1) US20120312399A1 (de)
EP (1) EP2362101B1 (de)
JP (1) JP5784636B2 (de)
CN (1) CN102762861B (de)
WO (1) WO2011101121A1 (de)

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US10876527B2 (en) * 2015-06-22 2020-12-29 Seko S.P.A. Bleed valve and self-bleeding pump provided with such valve
US20220412334A1 (en) * 2021-06-25 2022-12-29 Grundfos Holding A/S Monitoring method for monitoring the operation of a dosing pump and dosing pump system

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US9605669B2 (en) * 2014-03-19 2017-03-28 Graco Fluid Handling (A) Inc. Multi-port metering pump assembly and related methods
CN106438264B (zh) * 2015-08-04 2018-11-02 浙江福爱电子有限公司 一种脉冲泵
CN107989766A (zh) * 2017-11-27 2018-05-04 浙江艾力芬特泵业科技有限公司 带排气结构的柱塞式计量泵泵头及出口阀

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Publication number Priority date Publication date Assignee Title
US10876527B2 (en) * 2015-06-22 2020-12-29 Seko S.P.A. Bleed valve and self-bleeding pump provided with such valve
US20220412334A1 (en) * 2021-06-25 2022-12-29 Grundfos Holding A/S Monitoring method for monitoring the operation of a dosing pump and dosing pump system

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WO2011101121A1 (de) 2011-08-25
CN102762861A (zh) 2012-10-31
CN102762861B (zh) 2016-05-18
EP2362101B1 (de) 2013-07-03
JP5784636B2 (ja) 2015-09-24
EP2362101A1 (de) 2011-08-31
JP2013519831A (ja) 2013-05-30

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